mbedtls: fix possible false success in ...check_tags() helpers
mbedtls: fix possible false success in ...check_tags() helpers

We should report a error when the security check of the security
tag was not made. In the other case false success is possible and
is not observable by the software.

Technically this could lead to a security flaw.

Signed-off-by: Denis V. Lunev <5de907cd6e4798c6b518b331b937fac7cf24aede@gmail.com>

Mbed-TLS/mbedtls,ARMmbed/mbedtls,ARMmbed/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls,Mbed-TLS/mbedtls